Not much in town anymore. Of course, there is Vintage Hi-Fi on Babcock Blvd. Northern Audio is also on Babcock, about 1 1/2 miles down the road. I think it's appointment only. In Natrona Heights, there is Butches Sound Shack. The old Listening Post in Shadyside is a part of Northern Audio now.
An hour from the North Hills is the Sound Shop, in Canfinld OH, on Rt 224.
If there are others, someone please chime in. I am interested as well.